Insulator.



. To all 'whom tl concern Imran 'sTATpsrnENTOFFICE f .OsEPH A. sANDFOnD, Jn., or nasa* LIVERPOOL, OHIO, Ass-reuen To R. THOMAS AND.

.SONS. GOMPANY, QF 'EAST LIVERPOOL' OHIOr-A CORPORATION'LO'E OHIO.

INSULATOR.-

spc'm'eatioa of Leiters-Patent. 'Patentd Ain-' 14,1914.

Animation mea :une 1a, 1912. serial Noi 703,487;

Be it known that I, J OSEPH ADDISON SAND- Fonn, Jr., a citizen ofthe United States of America, residin at East Liverpool, in the county of Colum iana, State of Ohio, have invented certain new and useful Improvements 1n Insulators, of which` the following is a specification.

`M invention relates to insulators, and

y'particularly to'. insulators of the'built-u type, such, for instance, asfthat describe 1n my copending application, Serial No. 666,273, the object of my .present invention `being to improve the same in the features herewith disclosed.v

Inthe accompanying drawings vFigure 1 f in section', of Aan insulator .in 'which my improvement is `em- -bodied'in one form; Fig. '2' is asimilar view of a detail drawn to an enlarged scale.

It has beenfound in' assembling the interchangeable insulator units described in my copending apphcation above mentioned,

, v that it extremel. difficult l'to apply the cementing medium etween the unitsin uniorin quantity and thickness, withthe result .that the units are consequently spaced unequally apart.

Further, until the cement has set, there isa tendency for the. units,

-which are of'considerable weight, to displace.

the cement, squeezing part into the head of the bell and partout'at `the Open end, with the result that the units settle together and theinsulator' as a whole loses some of its height, and consequently some of its capacity. Again, inasmuch as the cement contains a'certain proportion of moisture when it is applied, and -inasmuch as the air-,chamber between the heads of the juxtaposed units is open to the joint, the air inthe lchamber takes up moisturevfrom the cement andthe electrostatic capacityof the insulator istoa certain extent diminished 'by reasonof the presence of this damp air in the air chamber. These various defects are now substantially eliminated bv the use Of spacing plugs of the character herewith illustrated.- In the particular form shown,"

which is of course merely an exemplary embodiment of my invention, this. spacing plug A takes the form of a disk '5, the periphery of 'which isofset' at 6 to form-ashoulder, while the remaining portion 7 is preferably beveled to the incline 'Of'theinner face of the bell insulater B with which it' isto be used.

Recesses 8 andr 9 may be formed in-the opposite faces of the plug, if desired.

the first bell unit B, having been fitted v-in v5 is inserted in the unit B, until it reaches a point of such diameter that it is' wedged in position. The diameter'of the plug is so predetermined that upon the insertion of the head of -the next bell unit B, thelatter V when resting upon 'the plug is peripherally spacedv the desired distancefrom the inner face of the bell so as to admit a suitable amount of cement b. -Inasmuch as the units-Y B are uniform and interchangeable in this particular type of insulator, it is obvious that the next plug 5 spacesthe next. unit B a like] distance from the superposed unit,

In building up an insulator of this type,

and so on throughout the height ofthe insulator. Consequently a uniformity of constr'uction and of capacity Iis Obtained with a certainty not otherwise, possible. Furthermore,'the plug has asecondary result by no means unimportant, viz., the exclusion of cement and its moisture from the air chambers C between the heads of the respective units. The cement b which is applied While the parts are in inverted. position,is halted by the 'shoulder 6 and has no opportunity to enter the air chamber or to meisten-the air therein. Agaim the plug adds to the mechanical strength ofthe joint between the units.

Obviously the plug may be made of any l desired' material, although preferably of porcelain or "other non-conductive, in order to prevent the condenser action which would take place werel metal employed. utility of the plug is not limited to the particular type of insulator illustrated but it may be employed in built up insulators of any suitable character.

I claim as my invention, V

1. A built up insulator having nested units, in combination with a plug 'disk peripherally engaged and supported within the head. of one unit and serving to space the succeeding unit from the latter and prevent .the entry yof cement into the space between the heads of juxtaposed units.

A built up Iinsulator having nested "units, in combination with a plug disk -wedged within the superposedunit for spacing the succeeding nestedum therefrom.

. 'A Ybuilt` up insulator havingvnested.

units spaced apart, an imperforat'e spacing the incline of the inner faee'of the insulator` 10 plug disk serving as spacing means and .havunit with which it is designed for use.

ing its periphery beveled to the incline of In testimony whereof I have signed my the inner face of the insulator unit with name to this specification, in the presence of which it is designed for use. A two subscribin Witnesses.r

4. A built up insulator having nested' JOSlPl-I A..SANDFORD, JR. units spaced apart, an imperforate spacing vWitnesses: plug disk serving as spacing means and hav- O. H. BONNER,

ing its periphery shouldered and beveled to RALPH R. ORB. 

